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NDA-24305 CHAPTER 5
Page 153
Revision 1.0
THREE-WAY CALLING-PRI
T-38 THREE-WAY CALLING-PRI
1. General Description
This feature enables any station user to add another party to an existing ISDN network connection, establishing
a Three-Way conference.
2. Operating Procedure
1. Place the original party on hold.
2. Press the hookswitch; receive Special Dial Tone.
3. Dial the desired number; receive an answer.
4. Announce the conference and press hookswitch again.
5. THREE-WAY CALLING-PRI is now established.
3. Programming
STEP 1: ASYD - System Data 2, Index 1, bits 0 & 1: Consultation Hold allowed or denied. 00: Denied;
01: Originating and Terminating Calls allowed,
Tandem Call Denied; 10: Only Terminating Calls
Allowed; 11: All calls allowed.
Index 6, bit 2: This bit remains as data “0”. CALL TRANSFER-ALL
CALLS [C-11].
bit 3: Enable add-on ability. This bit remains as data “0” to
allow THREE-WAY CALLING.
System Data 3, Index 2: Assign data 91H for Normal, hookswitch (Hooking) values.
STEP 2: ATRK - Assign these LENs as Route 909, Digital Conference Trunk. The LEN consists of the
following:
Group and Level numbers for the Digital Conference Trunk are 210, 213, 216, 221, 224,
227, 232 and 235.
STEP 3: MBTK - Make idle the Digital Conference Trunk.
STEP 4: ARRC - Allow for trunk-to-trunk connections between any two routes that may be used in THREE-
WAY CALLING. Assign these routes for ARI = A: This connection is for a station and two
trunks.
ARI = D: If the originating party hangs up, the remaining two parties will stay connected.
STEP 5: ARSC - The Route Restriction Class must be constructed so as to allow the station access to the
involved routes.
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